/**
  * @param string $serviceVariableName
  * @param ServiceModel $service
  * @return Tutorial
  */
 protected function addServiceDeclaration($serviceVariableName, ServiceModel $service)
 {
     $this->getFile()->getMainElement()->addChild(sprintf('$%s = new %s($options);', $serviceVariableName, $service->getPackagedName(true)));
     return $this;
 }